killer2239 said: i personally am an AMD user, just upgraded to Quad 9950 (2.6ghz) with 4gb ram) and i have absolutley no problems with the 64bit. I came from Dual core 4200+ athlon X2 running 32-bit with 1gb ram. Everything is so smooth, even using alpha flash player for the 64bit. I am doing a lot more with the 64bit system as far as modified desktop, more customizations, and it runs smoother than my 32bit X2 ever thought about running. No problems yet. I was curious about the 64bit switch just like you are, but i dont regret it one bit.
EDIT: And im still new to Ubuntu. Going on 3 or 4 weeks of use. Im really tempted to delete my entire windows partition. Just trying to find something that can auto sync ipod and do as well as itunes does first.
I currently have an x2_64 dual core, 1 gig 667mhzDDR2 so i'm a 64 user like you :) but i'm thinking about intel's i7 processors. I'm pretty surprised that i7 only takes ddr3 but i can appreciate the forward thinking of intel.
As for itunes, if you don't get something you can replace it with in linux you could try WINE
http://www.winehq.org/
or something like VirtualBox
Sun VirtualBox
I run XP in Vmware just so i can use my microdia webcam with skype. Skype is actually the only program i'm waiting for native 64 bit support for...